Uponor, formerly known as Wirsbo, is a leading manufacturer and supplier of Plumbing, Heating/Cooling, and Fire Safety Systems for residential and commercial building applications. The TruFLOW Jr. Assembly with Isolation and Balancing Valves (A2660301) comes completely assembled and ready to install for your Radiant and Cooling system. The isolation valves allow for a quick isolation of the loop by turning the black cap on the top of the manifold, while a balancing Hex Key on the internal balancing supply manifold helps to control the loop balance across the manifold. The manifold assembly is shipped with the appropriate number of TruFLOW Manifold Actuator Adapters (A2630028). The TruFlow Jr. body ends have R32 unions and the loop outlets have R20 male threads with a maximum recommended flow to the manifold of 14 gpm.